# Mixing Bleach and Hydrochloric Acid: Chlorine Gas Danger

> No — Strong acid + hypochlorite/chlorine-releasing compound releases toxic chlorine gas (Cl₂); never mix.

**Chemicals:** Hydrochloric acid (CAS 7647-01-0), Sodium hypochlorite (CAS 7681-52-9)

## Compatibility assessment

- **Verdict:** incompatible
- **Reason:** Strong acid + hypochlorite/chlorine-releasing compound releases toxic chlorine gas (Cl₂); never mix
- **Source:** reactive_group_rule
- **Citation:** CAMEO:1x44-acid-hypochlorite-chlorine-gas

## Source

- Source type: reactive_group_rule
- Last verified by MSDS Chain: 2026-07-15

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_Published by MSDS Chain (msdschain.lagentbot.com). Reference information, not a substitute for the manufacturer SDS or professional EHS judgement._